Do animals have umbilical cords?

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The discussion centers on the presence of belly buttons in mammals, specifically questioning why they are not easily visible in animals like cats and guinea pigs. It is noted that all placental mammals, including dolphins, have an umbilical cord during fetal development, which typically leaves a small, flat scar that is often concealed by fur. Unlike humans, who have a distinct belly button scar, these animals do not exhibit the same prominent feature. The conversation also touches on the mechanics of umbilical cord detachment, explaining that in most cases, the cord tears off naturally during birth, particularly in animals that give birth standing up. Instances are shared where kittens had cords that remained attached for several days, complicating their separation.
EnumaElish
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If they do, why can't we find Ms. Mimi's belly button?
 
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http://www.straightdope.com/classics/a1_001a.html
 
All placental mammals have an umbilical cord during fetal development. You won't find a clear belly button like humans have (it might be more interesting to ask why humans get such a distinct belly button "scar" that other mammals don't get), but there will be a small, usually flat, scar with lighter coloration than the skin around it. Typically it's hidden under fur.
 
So wait animals don't have to cut an umbilical cord, right? Does it just tear off by itself?
 
Most of the time the cord tears off by itself. Animals that birth standing up will tear the cord on the way out/down. I have seen a litter of kittens where the cords stayed attached to several kittens for what appeared to be a couple of days. They were all wrapped up on various body parts and it was hard to cut them apart.
 
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